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AD7674 Datasheet(PDF) 17 Page - Analog Devices

Part No. AD7674
Description  18-Bit, 2.5 LSB INL, 800 kSPS SAR ADC
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD7674 Datasheet(HTML) 17 Page - Analog Devices

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AD7674
Rev. A | Page 17 of 28
Transfer Functions
Except in 18-bit interface mode, the AD7674 offers straight
binary and twos complement output coding when using OB/2C.
See Figure 26 and Table 8 for the ideal transfer characteristic.
000...000
000...001
000...010
111...101
111...110
111...111
ANALOG INPUT
+FS – 1.5 LSB
+FS – 1 LSB
–FS + 1 LSB
–FS
–FS + 0.5 LSB
03083-0-026
Figure 26. ADC Ideal Transfer Function
Table 8. Output Codes and Ideal Input Voltages
Description
Analog Input
VREF = 4.096 V
Straight
Binary
(Hex)
Twos
Complement
(Hex)
FSR – 1 LSB
4.095962 V
3FFFF1
1FFFF1
FSR – 2 LSB
4.095924 V
3FFFE
1FFFE
Midscale + 1 LSB
31.25 μV
20001
00001
Midscale
0 V
20000
00000
Midscale – 1 LSB
–31.25 μV
1FFFF
3FFFF
–FSR + 1 LSB
–4.095962 V
00001
20001
–FSR
–4.096 V
000002
200002
1 This is also the code for overrange analog input (VIN+ – VIN–
above VREF – VREFGND).
2 This is also the code for underrange analog input (VIN+ – VIN–
below –VREF + VREFGND).
AVDD
AGND
DGND
DVDD
OVDD
OGND
CNVST
BUSY
SDOUT
SCLK
RD
CS
RESET
PD
2.5V REF
NOTE 1
REFBUFIN
20
Ω
D
CLOCK
AD7674
μC/μP/DSP
SERIAL PORT
DIGITAL SUPPLY
(3.3V OR 5V)
ANALOG
SUPPLY
(5V)
DVDD
OB/2C
NOTE 6
PDBUF
DVDD
50k
Ω
100nF
1M
Ω
IN+
ANALOG INPUT+
CC
2.7nF
U1
NOTE 3
NOTE 4
50
Ω
AD8021
+
15
Ω
NOTE 2
NOTE 5
ADR421
10
μF
100nF
+
10
μ F
100nF
+
100nF
+
10
μ F
IN–
ANALOG INPUT–
CC
2.7nF
U2
NOTE 3
NOTE 4
50
Ω
AD8021
+
15
Ω
50
Ω
100nF
NOTES
1. SEE VOLTAGE REFERENCE INPUT SECTION.
2. OPTIONAL CIRCUITRY FOR HARDWARE GAIN CALIBRATION.
3.THE AD8021 IS RECOMMENDED. SEE DRIVER AMPLIFIER CHOICE SECTION.
4. SEE ANALOG INPUTS SECTION.
5. OPTION, SEE POWER SUPPLY SECTION.
6. OPTIONAL LOW JITTER CNVST, SEE CONVERSION CONTROL SECTION.
47
μF
MODE1
MODE0
NOTE 1
CREF
REF
REFGND
03083-0-027
Figure 27. Typical Connection Diagram (Internal Reference Buffer, Serial Interface)


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